been around computers for a long time and cant get thisone figured out. took old ribbon dvd drive out for new sata dvd drive, and since cant get picture. tried replacing EVERY PART IN MY SYSTEM 1 part at a time. thinkin its somethin little im misssng. replaced mobo, still no pic outa card, returned that mobo and got new graphics card... still no picture. tried different processor still no pic, tried diff ram, tried diff power supply, tried diff hard drive, ive tried it all and im gettin aggrevated. intel mobo, nvidia geforce 7800, dual core.